Backlight Dynamic Waveform for LCD Flicker Compensation
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Solution Overview
Problem
Liquid Crystal Displays (LCDs) experience flicker at low driving frequencies due to drops in voltage holding ratio, leading to poor user experience and increased power consumption.
Innovation Solution
Generating a dynamic waveform for the backlight that varies illumination levels in synchronization with the driving rate of the LCD, compensating for flicker by increasing luminosity during voltage-holding ratio drops, and adjusting based on image grey levels and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving frequency of the LCD is reduced to lower power consumption, then power consumption is reduced, but flicker occurs due to drops in voltage holding ratio
Solution Approach 1:
The backlight controller implements periodic action by dynamically adjusting the backlight intensity at specific intervals synchronized with the LCD refresh cycle. The controller increases backlight intensity during the voltage holding ratio drop period (second time interval) and maintains or reduces intensity during other periods, creating a periodic compensation pattern that eliminates flicker while maintaining low driving frequency operation
Solution Approach 2:
The system applies parameter changes by modifying the backlight intensity parameter in response to voltage holding ratio variations. The controller detects voltage holding ratio drops and dynamically adjusts backlight intensity parameters (increasing intensity during drop periods, maintaining or reducing intensity otherwise), thereby compensating for the harmful effect of low driving frequency without changing the fundamental refresh rate parameter
2Reliability
If the backlight intensity is increased to compensate for flicker, then image stability is improved, but power consumption increases
Solution Approach 1:
The backlight controller implements periodic action by dynamically adjusting the backlight intensity at specific intervals synchronized with the LCD refresh cycle. The controller increases backlight intensity during the voltage holding ratio drop period (second time interval) and maintains or reduces intensity during other periods, creating a periodic compensation pattern that eliminates flicker while maintaining low driving frequency operation
Solution Approach 2:
The system applies preliminary action by detecting voltage holding ratio drops in advance and proactively increasing backlight intensity before the flicker becomes visible to users. The controller monitors voltage holding ratio and anticipates the harmful effect, adjusting backlight intensity preemptively during the drop period to maintain image stability without requiring continuous high intensity operation
3Reliability
If a dynamic waveform is applied to the backlight to compensate for flicker, then image stability is improved, but device complexity increases
Solution Approach 1:
The system implements feedback by continuously monitoring the voltage holding ratio of the LCD and using this information to dynamically adjust the backlight intensity. The controller receives feedback about voltage holding ratio drops and automatically modifies backlight parameters accordingly, creating a closed-loop control system that maintains image stability while managing complexity through automated response
Solution Approach 2:
The backlight controller applies self-service by autonomously detecting voltage holding ratio conditions and automatically adjusting backlight intensity without requiring external intervention or complex user configuration. The system monitors its own operating conditions and self-regulates to compensate for flicker, reducing the need for additional user-facing controls or complex external management
Data Source
AI summary
Certain embodiments are directed to techniques (e.g., a method, an apparatus, and non-transitory computer readable medium storing code or instructions executable by one or more processors) for mitigating the flicker on the displays at low driving frequencies due to drops of the voltage holding ratio of the materials for the display. The techniques to compensate for flicker in a liquid crystal display can include generating a dynamic waveform for the backlight of the display. The dynamic waveform can be synchronized with the driving rate of the liquid crystal display such that the luminosity of the backlight increases during periods when the voltage-holding ratio drops in the materials of the display. In this way, a liquid crystal material can be utilized in a display to generate reduced power consumption with liquid crystal rate minimizing the flicker in response to the drops of the voltage-holding ratio.